The Yealink EXP38 is an expansion module that adds an additional thirty eight programmable buttons to your Yealink IP phone. The EXP38 features dual color indicator lights so you can see the status of each line, extension, or speed dial. This module, also known as a DSS console, is compatible with the SIP-T26P, SIP-T28P, and SIP-T38G phones while receiving power directly from the phone itself. Up to six expansion modules can be stacked or combined.